Ackland's Scale of Photographic Equivalents
Exposure Measurement
Ackland's Scale of Photographic Equivalents
1895
Wood, paper, and metal
Overall: 14 9/16 × 2 3/4 × 3/8 in. (37 × 7 × 1 cm)
Gift of Eastman Kodak Company, ex-collection Gabriel Cromer
DescriptionSlide ruler for "converting values of haloids and salts".
Inscriptions Inscribed in pencil, rear, TL: Ca 1895
Printed in black ink, front center sliding scale, C: [numerical scale]
Printed in black ink, front left and right of scale: [photographic chemicals]
Printed in black ink, rear, in three columns of text: [complete instructions]
Printed in black ink, front center sliding scale, C: [numerical scale]
Printed in black ink, front left and right of scale: [photographic chemicals]
Printed in black ink, rear, in three columns of text: [complete instructions]
