Burglar alarms like this one are designed to alert the user to danger. Sensors are connected to a control unit through a low voltage wiring that interacts with a response device.

Burglar Detention Alarm

Burglar alarms like this one are designed to alert the user to danger. Sensors are connected to a control…

"Raise both arms laterally until horizontal; swing both simultaneously upward until vertical and return to the horizontal; repeat several times." — Moss, 1914

As skirmishers, guide center, march

"Raise both arms laterally until horizontal; swing both simultaneously upward until vertical and return…

"Raise both arms laterally until horizontal; hold the arm on the side of the guide steadily in the horizontal position; swing the other upward until vertical and return it to the horizontal; repeat several times." — Moss, 1914

As skirmishers, guide right (left), march

"Raise both arms laterally until horizontal; hold the arm on the side of the guide steadily in the horizontal…

"Raise both arms laterally until horizontal." — Moss, 1914

As skirmishers, march

"Raise both arms laterally until horizontal." — Moss, 1914

"Raise the arm vertically to its full extent and describe horizontal circles." — Moss, 1914

Assemble, march

"Raise the arm vertically to its full extent and describe horizontal circles." — Moss, 1914

"The hand on the side toward which the change of direction is to be made is carried across the body to the opposite shoulder, forearm horizontal; then swing in a horizontal plane, arm extended, pointing in the new direction." — Moss, 1914

Change direction

"The hand on the side toward which the change of direction is to be made is carried across the body…

"1. A horn used on board a vessel to sound a warning signal to other vessels in foggy weather. 2. A sounding instrument for warning vessels off shore during a fog. The most powerful of these instruments is the siren, or siren fog-horn." -Whitney, 1911

Brown's Siren Foghorn

"1. A horn used on board a vessel to sound a warning signal to other vessels in foggy weather. 2. A…

"Carry the hand to the shoulder; rapidly thrust the hand upward the full extent of the arm several times." — Moss, 1914

Halt

"Carry the hand to the shoulder; rapidly thrust the hand upward the full extent of the arm several times."…

"To announce range, extend the arm toward the leaders or men for whom the signal is intended, fist closed; by keeping the fist closed battle sight is indicated; by opening and closing the fist, expose thumb and fingers to a number equal to the hundreds of yards." — Moss, 1914

Hand signal

"To announce range, extend the arm toward the leaders or men for whom the signal is intended, fist closed;…

"To add 50 yards describe a short horizontal line with forefinger." — Moss, 1914

Hand signal

"To add 50 yards describe a short horizontal line with forefinger." — Moss, 1914

"To change elevation, indicate the amount of increase or decrease by fingers; point upward to indicate increase and downward to indicate decrease." — Moss, 1914

Hand signal

"To change elevation, indicate the amount of increase or decrease by fingers; point upward to indicate…

"Extend the arm horizontally toward the platoon leader; describe small circles with the hand." — Moss, 1914

Hand signal

"Extend the arm horizontally toward the platoon leader; describe small circles with the hand." —…

Naval signalling code.

Naval signalling

Naval signalling code.

"To announce range, extend the arm towar the leaders or men for whom the signal is intended, fist closed; by keeping the fist closed battle sight is indicated." — Moss, 1914

Range or change elevation

"To announce range, extend the arm towar the leaders or men for whom the signal is intended, fist closed;…

"Railway Semaphore. a, lever, which operates both b, blade, and c, lantern." -Whitney, 1911

Railroad Semaphore

"Railway Semaphore. a, lever, which operates both b, blade, and c, lantern." -Whitney, 1911

Flag signal for the letter A, error, or the number one.

Signal A

Flag signal for the letter A, error, or the number one.

Signal for attention.

Signal Attention

Signal for attention.

Signal for the letter B, or the number two.

Signal B

Signal for the letter B, or the number two.

A signal book used in the United States Navy which includes a key to interpret messages.

Signal Book

A signal book used in the United States Navy which includes a key to interpret messages.

Signal for the letter C, the number three, or repeat.

Signal C

Signal for the letter C, the number three, or repeat.

Signal for the letter D, or the number four.

Signal D

Signal for the letter D, or the number four.

Signal for the letter E, or the number five.

Signal E

Signal for the letter E, or the number five.

Signal for the letter F, or the number 6.

Signal F

Signal for the letter F, or the number 6.

Signal for the letter G, and the number seven.

Signal G

Signal for the letter G, and the number seven.

Signal for the letter H, or the number eight.

Signal H

Signal for the letter H, or the number eight.

Signal for the letter I and the number 9.

Signal I

Signal for the letter I and the number 9.

Signal for an interval.

Signal interval

Signal for an interval.

Signal for zero and the letter J.

Signal J

Signal for zero and the letter J.

Signal for negative and the letter K.

Signal K

Signal for negative and the letter K.

Signal for the letter L.

Signal L

Signal for the letter L.

Signal for the letter M.

Signal M

Signal for the letter M.

Signal for the letter N.

Signal N

Signal for the letter N.

Signal for numerals.

Signal numerals

Signal for numerals.

Signal for the letter O, and an interrogatory.

Signal O

Signal for the letter O, and an interrogatory.

Signal for an affirmative, and the letter P.

Signal P

Signal for an affirmative, and the letter P.

Signal for the letter Q.

Signal Q

Signal for the letter Q.

Signal for acknowledgement, and the letter R.

Signal R

Signal for acknowledgement, and the letter R.

Signal for the letter S.

Signal S

Signal for the letter S.

Signal for the letter T.

Signal T

Signal for the letter T.

Signal for the letter U.

Signal U

Signal for the letter U.

Signal for the letter V.

Signal V

Signal for the letter V.

Signal for the letter W.

Signal W

Signal for the letter W.

Signal for the letter X.

Signal X

Signal for the letter X.

Signal for the letter Y.

Signal Y

Signal for the letter Y.

Signal for the letter Z.

Signal Z

Signal for the letter Z.

A signal is a mechanical or electrical device erected beside a railway line to pass information relating to the state of the line ahead.

Railway Signal

A signal is a mechanical or electrical device erected beside a railway line to pass information relating…

"Extend the arm horizontally toward the platoon leader; swing the hand up and down from the wrist." — Moss, 1914

Squad

"Extend the arm horizontally toward the platoon leader; swing the hand up and down from the wrist."…

"Extend the arm vertically above the head; carry it laterally downward to the side and swing it several times between the vertical and downward positions." — Moss, 1914

Squad right about, march

"Extend the arm vertically above the head; carry it laterally downward to the side and swing it several…

"Raise the arm laterally until horizontal; carry it downward to the side and swing it several times between the downward and horizontal positions." — Anthon, 1891

Squads left, march

"Raise the arm laterally until horizontal; carry it downward to the side and swing it several times…

"Raise the arm laterally until horizontal; carry it to a vertical position above the head and swing it several times between the vertical and horizontal positions." &— Moss, 1914

Squads right, march

"Raise the arm laterally until horizontal; carry it to a vertical position above the head and swing…

"Raise and hold the forearm steadily in a horizontal position in front of the forehead, palm of the hand to the front." — Moss, 1914

Suspend firing

"Raise and hold the forearm steadily in a horizontal position in front of the forehead, palm of the…