A subsidiary in Germany, followed by another in Belgium, laid out the brand's European expansion. 1980 marked the date when Phillipe Cassegrain (son of Jean Cassegrain) took over the family business.
The Longchamp company began in 1948 when its founder, Jean Cassegrain, started manufacturing leather coverings for pipes.
It may be applied to the open end of a reflecting telescope, either of the Newtonian or the Cassegrain construction."
P. 419) suggested the division of the small speculum of a Cassegrain telescope and the production of double image by micrometric rotation of the semispecula in the plane passing through their axis.
A third form of reflecting telescope was devised in 1672 by Cassegrain (Journal des Scavans, 1672).
The Cassegrain telescope differs from the Gregorian only in the substitution of a convex hyperboloidal mirror for a concave ellipsoidal mirror as the small speculum.
Fewer telescopes have been made of this than perhaps of any other form of reflector; but in comparatively recent years the Cassegrain has acquired importance from the fact of its adoption for the great Melbourne telescope, and from its employment in the 60-in.
(2) As a Cassegrain reflector, fig.
(3) As a Cassegrain reflector, for photographing the moon, planets or very bright nebulae on a large scale, as shown in fig.
(4) As a Cassegrain reflector, for use with a spectroscope mounted in place of the photographic plate, fig.