Objects by: John A. Brashear

1 to 12 of 15 Maker Information

1.875 x 2.25 inch rock salt prism in sealed tube

John A. Brashear

1916

1 equilateral prism

John A. Brashear

circa 1890

3.25 x 3.5 inch, half-prism

Alvan Clark and Sons

1875-1900

4 equilateral prisms

John A. Brashear

circa 1890

collimating telescope for spectroscope

John A. Brashear

1880-1900

$concave diffraction grating$

concave diffraction grating

American

1903

$flat diffraction grating$

flat diffraction grating

Henry A. Rowland

1887

$Rowland concave diffraction grating$

Rowland concave diffraction grating

Henry A. Rowland

1894

$Rowland concave diffraction grating$

Rowland concave diffraction grating

American

1903

$Rowland concave diffraction grating in stand$

Rowland concave diffraction grating in stand

Henry A. Rowland

1897

$Rowland diffraction grating$

Rowland diffraction grating

Henry A. Rowland

1890-1901

$Rowland reflection diffraction grating$

Rowland reflection diffraction grating

Henry A. Rowland

circa 1887

Objects by: John A. Brashear

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1.875 x 2.25 inch rock salt prism in sealed tube

1 equilateral prism

3.25 x 3.5 inch, half-prism

4 equilateral prisms

collimating telescope for spectroscope

concave diffraction grating

flat diffraction grating

Rowland concave diffraction grating

Rowland concave diffraction grating

Rowland concave diffraction grating in stand

Rowland diffraction grating

Rowland reflection diffraction grating